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問題詳情:

 JohnLogieBairdconstructedthefirstcolorTVin1928,butitwa...

 John Logie Baird constructed the first color TV in 1928, but it was not until 1938 _________ the first color TV program was broadcast.

  A. which          B. that             C. when             D. who

【回答】

B

知識點:強調句

題型:選擇題

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